free_mutant/lib/mutant/mutator/node/if_statement.rb
2012-12-06 21:30:28 +01:00

150 lines
3.3 KiB
Ruby

module Mutant
class Mutator
class Node
# Mutator for Rubinius::AST::If nodes
class IfStatement < self
handle(Rubinius::AST::If)
private
# Emit mutations on Rubinius::AST::If nodes
#
# @return [undefined]
#
# @api private
#
def dispatch
emit_condition_mutants
emit_if_branch_mutants
emit_else_branch_mutants
emit_inverted_condition
emit_deleted_if_branch
emit_deleted_else_branch
end
# Emit inverted condition
#
# Especially the same like swap branches but more universal as it also
# covers the case there is no else branch
#
# @return [undefined]
#
# @api private
#
def emit_inverted_condition
emit_self(invert(condition), if_branch, else_branch)
end
# Emit deleted else branch
#
# @return [undefined]
#
# @api private
#
def emit_deleted_else_branch
emit_self(condition, if_branch, nil)
end
# Emit deleted if branch
#
# @return [undefined]
#
# @api private
#
def emit_deleted_if_branch
body = else_branch
return unless body
emit_self(condition, else_branch, nil)
end
# Return ast that returns inverted boolean value
#
# @param [Rubinius::Node::AST] node
#
# @return [Rubinius::Node::AST]
#
# @api private
#
# Using :'!' instead of :! since syntax highlighting in vim does not
# capture literal symbol.
#
def invert(node)
if Helper.on_18?
return new(Rubinius::AST::Not, node)
end
new_send(node,:'!')
end
# Emit mutants of condition
#
# @return [undefined]
#
# @api private
#
def emit_condition_mutants
Mutator.each(condition) do |mutant|
emit_self(mutant, if_branch, else_branch)
end
end
# Emit if body mutations
#
# @return [undefined]
#
# @api private
#
def emit_if_branch_mutants
Mutator.each(if_branch) do |mutant|
emit_self(condition, mutant, else_branch)
end
end
# Emit else body mutations
#
# @return [undefined]
#
# @api private
#
def emit_else_branch_mutants
body = else_branch
return unless body
Mutator.each(body) do |mutant|
emit_self(condition, if_branch, mutant)
end
end
# Return if_branch of node
#
# @return [Rubinius::AST::Node]
#
# @api private
#
def if_branch
node.body
end
# Return condition of node
#
# @return [Rubinius::AST::Node]
#
# @api private
#
def condition
node.condition
end
# Return else body of node
#
# @return [Rubinius::AST::Node]
#
# @api private
#
def else_branch
node.else
end
end
end
end
end